Motor bogs down in second and third gears. At idle it seems to get plenty of fuel. Carb is brand new and as far as i know my mechanic adjusted the choke properly. Fuel pump looks new, but when i took off the fuel filter it was mostly dry. When filling the fuel tank it appeared that fuel overfilled from the top of the tank. I don't think that is normal but it shouldnt haveanything to do with why the performace stops at around 25-30 mph.
Make sure that the fuel line from the tank to the pump is not dry or cracked; the pump could be sucking air.
You can check the fuel pump by disconnecting the line from the carb and running it into a catch can -- a quart glass jar would be good. Turn the engine with the starter (you can pull the coil wire so it doesn't run on the gas in the carb). You should see a steady stream of fuel coming out. If not the pump may not be pumping to full capacity. Also check the oil. If it's over full or smells like gas the fuel pump could have a leak in the diaphram and be pumping gas in the oil. Tha'ts not good to say the least! Checking the fuel line is a good idea also, as already mentioned. There is a short rubber hose from the tank to the metal line and from the metal line to the pump, then the lines from the pump to the carb. All the rubber lines should be checked. On a vehicle that old I'd just replace them. Should be 5/16" line.
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Something lodged in tank or lines somewhere! compressed air backwards through line and try again!
SOURCE: 89 Wagoneer drives rough
The thing to do now is a fuel pressure test pump could be weak just a few pounds under the recamended pressure will do that weather its mechanical or electrical . Is there a filter in the carb. wear fuel fine hooks? If none of this is an issue at least you can eliminate fuel deliverly as the problem.
SOURCE: problems with fuel?
I always have a problem with the word "seems" when used in diagnostics...Actual pressures are important. However, your problem may be more related to a map sensor or throttle position sensor. Get an inexpensive manual and do some testing using a decent volt/ohm meter and see what you come up with. (map sensor also needs vacuum hand pump to do some testing)
SOURCE: 1987 jeep wrangle will not start or run
Uncouple the fuel line coming from the pump at the carburetor, place a clean can under the line, and have someone operate the starter--you should have fuel shoot from the line in spurts as the engine turns. If it does, then the entry port on the carburetor is plugged. Remove the float assembly and pull out the float needle valve. Hook the fuel line back to the carburetor and try the starter again, there should be fuel pumping into the float bowl. If not, check to see if there is a filter on the fuel inlet path that may be plugged. If no filter, remove the float needle seat to see if something is blocking the fuel passage. If all else fails, use compressed air to blow backwards through the needle seat (remove the fuel line again). Hope some of this helps!
did you change sending unit? that is what sends the signal of amount of fuel. if so then your gauge motor is worn. get a new cluster from wreckers. check all wiring for bad grounds
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